It is composed of the microprocessor system and a serial port controller. The software is divided into main program and interruption program.
硬件结构由微处理器和串口控制器两部分组成，程序分为主程序和中断子程序两部分。
Like a serial port, each USB port on a computer is assigned a unique identification number (port id) by the USB controller.
像串行端口一样，计算机上每一个usb端口都由US b控制器指定了一个惟一的标识数字(端口id)。
Set the IP address of each controller using the serial port at the back of each enclosure.
使用每个封装背面的串行口设置每个控制器的IP地址。
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